Pit Bull Terrier is a label for a type of dog more than a single breed. It covers the American Pit Bull Terrier, American Staffordshire Terrier, Staffordshire Bull Terrier, American Bullies and many mixes with broad heads and muscular builds. All trace back to nineteenth-century British bull-and-terrier dogs, and shelter breed labels often don't match DNA, so a dog can look the part without sharing the ancestry.
Most are medium-sized and athletic, usually 30 to 65 pounds, with affectionate, eager-to-please personalities. The short coat needs little grooming but offers little insulation. Their strength makes training and careful introductions important, and some are selective about other dogs. Adult dogs are plentiful, so a dog's current behavior can guide the decision.